What does code P1291 mean?

Q: What does code P1291 mean?

Injector High Side Short To GND Or VBATT Bank 1. P1291 on Ford vehicles indicates that the powertrain control module (PCM) has detected an abnormal electrical condition on the high side of one or more fuel injectors in bank 1, specifically a short to ground or battery voltage. The PCM monitors injector driver circuits and sets this code when the voltage on the high-side control wire falls outside the expected range, which can prevent proper injector operation and affect engine performance.

DTC codes / Ford codes / P1291

P1291 · FordInjector High Side Short To GND Or VBATT Bank 1

P1291 on Ford vehicles indicates that the powertrain control module (PCM) has detected an abnormal electrical condition on the high side of one or more fuel injectors in bank 1, specifically a short to ground or battery voltage. The PCM monitors injector driver circuits and sets this code when the voltage on the high-side control wire falls outside the expected range, which can prevent proper injector operation and affect engine performance.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.